Do We Want an Erasable Internet?

This is going to sound silly, but I think Snapchat was the most important technology of 2013.

It sounds silly because Snapchat is just an app. What's more, it's an app used primarily by teens and college students, and wasn't I telling you just a few weeks ago that young people aren't good predictors of tech success?

Then there's the question of whether Snapchat is useful at all. Snapchat sends so-called ephemeral messages,...